GM Service Manual Online
For 1990-2009 cars only

If your vehicle is equipped with memory mirrors, it is capable of performing the park tilt mirror feature. This feature allows the driver and passenger side mirror to tilt to a factory programmed position when the vehicle is in R (Reverse). This feature may be useful in allowing you to view the curb when you are parallel parking.

When the vehicle is shifted out of R (Reverse) and either a five-second delay has occurred, or the ignition is turned to LOCK/OFF, the driver and passenger side mirror will return to its original position.

This feature can be enabled/disabled through the Driver Information Center (DIC). See DIC Vehicle Customization for more information.